1 /* $FreeBSD$ */ 2 /* $OpenBSD: ip_ipsp.h,v 1.119 2002/03/14 01:27:11 millert Exp $ */ 3 /*- 4 * The authors of this code are John Ioannidis (ji@tla.org), 5 * Angelos D. Keromytis (kermit@csd.uch.gr), 6 * Niels Provos (provos@physnet.uni-hamburg.de) and 7 * Niklas Hallqvist (niklas@appli.se). 8 * 9 * The original version of this code was written by John Ioannidis 10 * for BSD/OS in Athens, Greece, in November 1995. 11 * 12 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, 13 * by Angelos D. Keromytis. 14 * 15 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis 16 * and Niels Provos. 17 * 18 * Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist. 19 * 20 * Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis, 21 * Angelos D. Keromytis and Niels Provos. 22 * Copyright (c) 1999 Niklas Hallqvist. 23 * Copyright (c) 2001, Angelos D. Keromytis. 24 * 25 * Permission to use, copy, and modify this software with or without fee 26 * is hereby granted, provided that this entire notice is included in 27 * all copies of any software which is or includes a copy or 28 * modification of this software. 29 * You may use this code under the GNU public license if you so wish. Please 30 * contribute changes back to the authors under this freer than GPL license 31 * so that we may further the use of strong encryption without limitations to 32 * all. 33 * 34 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR 35 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY 36 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE 37 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR 38 * PURPOSE. 39 */ 40 41 #ifndef _NETIPSEC_XFORM_H_ 42 #define _NETIPSEC_XFORM_H_ 43 44 #include <sys/types.h> 45 #include <sys/queue.h> 46 #include <netinet/in.h> 47 #include <opencrypto/xform.h> 48 49 #define AH_HMAC_HASHLEN 12 /* 96 bits of authenticator */ 50 #define AH_HMAC_MAXHASHLEN (SHA2_512_HASH_LEN/2) /* Keep this updated */ 51 #define AH_HMAC_INITIAL_RPL 1 /* replay counter initial value */ 52 53 #ifdef _KERNEL 54 struct secpolicy; 55 struct secasvar; 56 57 /* 58 * Packet tag assigned on completion of IPsec processing; used 59 * to speedup security policy checking for INBOUND packets. 60 */ 61 struct xform_history { 62 union sockaddr_union dst; /* destination address */ 63 uint32_t spi; /* Security Parameters Index */ 64 uint8_t proto; /* IPPROTO_ESP or IPPROTO_AH */ 65 uint8_t mode; /* transport or tunnel */ 66 }; 67 68 /* 69 * Opaque data structure hung off a crypto operation descriptor. 70 */ 71 struct xform_data { 72 struct secpolicy *sp; /* security policy */ 73 struct secasvar *sav; /* related SA */ 74 crypto_session_t cryptoid; /* used crypto session */ 75 u_int idx; /* IPsec request index */ 76 int protoff; /* current protocol offset */ 77 int skip; /* data offset */ 78 uint8_t nxt; /* next protocol, e.g. IPV4 */ 79 struct vnet *vnet; 80 }; 81 82 #define XF_IP4 1 /* unused */ 83 #define XF_AH 2 /* AH */ 84 #define XF_ESP 3 /* ESP */ 85 #define XF_TCPSIGNATURE 5 /* TCP MD5 Signature option, RFC 2358 */ 86 #define XF_IPCOMP 6 /* IPCOMP */ 87 88 struct xformsw { 89 u_short xf_type; /* xform ID */ 90 const char *xf_name; /* human-readable name */ 91 int (*xf_init)(struct secasvar*, struct xformsw*); /* setup */ 92 int (*xf_zeroize)(struct secasvar*); /* cleanup */ 93 int (*xf_input)(struct mbuf*, struct secasvar*, /* input */ 94 int, int); 95 int (*xf_output)(struct mbuf*, /* output */ 96 struct secpolicy *, struct secasvar *, u_int, int, int); 97 98 volatile u_int xf_cntr; 99 LIST_ENTRY(xformsw) chain; 100 }; 101 102 const struct enc_xform * enc_algorithm_lookup(int); 103 const struct auth_hash * auth_algorithm_lookup(int); 104 const struct comp_algo * comp_algorithm_lookup(int); 105 106 void xform_attach(void *); 107 void xform_detach(void *); 108 int xform_init(struct secasvar *, u_short); 109 110 struct crypto_session_params; 111 /* XF_AH */ 112 int xform_ah_authsize(const struct auth_hash *); 113 int ah_init0(struct secasvar *, struct xformsw *, 114 struct crypto_session_params *); 115 extern int ah_zeroize(struct secasvar *sav); 116 extern size_t ah_hdrsiz(struct secasvar *); 117 118 /* XF_ESP */ 119 extern size_t esp_hdrsiz(struct secasvar *sav); 120 121 #endif /* _KERNEL */ 122 #endif /* _NETIPSEC_XFORM_H_ */ 123